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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/proxy_client_socket.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/stringprintf.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/http/http_auth_controller.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "url/gurl.h"
namespace net {
namespace {
void CopyHeaderValues(scoped_refptr<HttpResponseHeaders> source,
scoped_refptr<HttpResponseHeaders> dest,
const std::string& header_name) {
size_t iter = 0;
std::string header_value;
while (source->EnumerateHeader(&iter, header_name, &header_value))
dest->AddHeader(header_name + ": " + header_value);
}
} // namespace
// static
void ProxyClientSocket::BuildTunnelRequest(
const HostPortPair& endpoint,
const HttpRequestHeaders& auth_headers,
const std::string& user_agent,
std::string* request_line,
HttpRequestHeaders* request_headers) {
// RFC 7230 Section 5.4 says a client MUST send a Host header field in all
// HTTP/1.1 request messages, and Host SHOULD be the first header field
// following the request-line. Add "Proxy-Connection: keep-alive" for compat
// with HTTP/1.0 proxies such as Squid (required for NTLM authentication).
std::string host_and_port = endpoint.ToString();
*request_line =
base::StringPrintf("CONNECT %s HTTP/1.1\r\n", host_and_port.c_str());
request_headers->SetHeader(HttpRequestHeaders::kHost, host_and_port);
request_headers->SetHeader(HttpRequestHeaders::kProxyConnection,
"keep-alive");
if (!user_agent.empty())
request_headers->SetHeader(HttpRequestHeaders::kUserAgent, user_agent);
request_headers->MergeFrom(auth_headers);
}
// static
int ProxyClientSocket::HandleProxyAuthChallenge(HttpAuthController* auth,
HttpResponseInfo* response,
const BoundNetLog& net_log) {
DCHECK(response->headers.get());
int rv = auth->HandleAuthChallenge(response->headers, false, true, net_log);
response->auth_challenge = auth->auth_info();
if (rv == OK)
return ERR_PROXY_AUTH_REQUESTED;
return rv;
}
// static
void ProxyClientSocket::LogBlockedTunnelResponse(int http_status_code,
bool is_https_proxy) {
if (is_https_proxy) {
UMA_HISTOGRAM_CUSTOM_ENUMERATION(
"Net.BlockedTunnelResponse.HttpsProxy",
HttpUtil::MapStatusCodeForHistogram(http_status_code),
HttpUtil::GetStatusCodesForHistogram());
} else {
UMA_HISTOGRAM_CUSTOM_ENUMERATION(
"Net.BlockedTunnelResponse.HttpProxy",
HttpUtil::MapStatusCodeForHistogram(http_status_code),
HttpUtil::GetStatusCodesForHistogram());
}
}
// static
bool ProxyClientSocket::SanitizeProxyAuth(HttpResponseInfo* response) {
DCHECK(response && response->headers.get());
scoped_refptr<HttpResponseHeaders> old_headers = response->headers;
const char kHeaders[] = "HTTP/1.1 407 Proxy Authentication Required\n\n";
scoped_refptr<HttpResponseHeaders> new_headers = new HttpResponseHeaders(
HttpUtil::AssembleRawHeaders(kHeaders, arraysize(kHeaders)));
// Copy status line and all hop-by-hop headers to preserve keep-alive
// behavior.
new_headers->ReplaceStatusLine(old_headers->GetStatusLine());
CopyHeaderValues(old_headers, new_headers, "connection");
CopyHeaderValues(old_headers, new_headers, "proxy-connection");
CopyHeaderValues(old_headers, new_headers, "keep-alive");
CopyHeaderValues(old_headers, new_headers, "trailer");
CopyHeaderValues(old_headers, new_headers, "transfer-encoding");
CopyHeaderValues(old_headers, new_headers, "upgrade");
CopyHeaderValues(old_headers, new_headers, "content-length");
CopyHeaderValues(old_headers, new_headers, "proxy-authenticate");
response->headers = new_headers;
return true;
}
// static
bool ProxyClientSocket::SanitizeProxyRedirect(HttpResponseInfo* response) {
DCHECK(response && response->headers.get());
std::string location;
if (!response->headers->IsRedirect(&location))
return false;
// Return minimal headers; set "Content-Length: 0" to ignore response body.
std::string fake_response_headers = base::StringPrintf(
"HTTP/1.0 302 Found\n"
"Location: %s\n"
"Content-Length: 0\n"
"Connection: close\n"
"\n",
location.c_str());
std::string raw_headers =
HttpUtil::AssembleRawHeaders(fake_response_headers.data(),
fake_response_headers.length());
response->headers = new HttpResponseHeaders(raw_headers);
return true;
}
} // namespace net
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